Seawater carbonate chemistry and coccolithophore abundances and CaCO3 concentrations during the 2013 MedSeA mesocosm experiment ...

• Main Authors: D'Amario, Barbara, Pérez-Mejías, Carlos, Grelaud, Michaël, Paraskevi, Pitta, Krasakopoulou, Evangelia, Ziveri, Patrizia
• Format: Dataset
• Language: English
• Published: PANGAEA 2020
• Subjects: Calcification/Dissolution; Coast and continental shelf; Community composition and diversity; Entire community; Growth/Morphology; Laboratory experiment; Mediterranean Sea; Mesocosm or benthocosm; Pelagos; Temperate; Temperature; Type; DATE/TIME; Day of experiment; Treatment; Calcium carbonate, particulate; Cell density; Mass; Coccospheres, malformed; Salinity; Temperature, water; pH; Carbon dioxide; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Alkalinity, total; Nitrite; Nitrate; Ammonia; Phosphate; Silicate; Carbonate system computation flag; Aragonite saturation state; Calcite saturation state; Mesocosm experiment; Counted; Measured and/or detected by SYRACO software; Calculated; Conductivity sensor, Aanderaa, type 3919; Pendant Temperature/Light Data Logger 64K, HOBO; Potentiometric; Calculated using seacarb after Nisumaa et al. 2010; Potentiometric titration; Seawater analysis Strickland & Parsons, 1972; Seawater analysis Ivancic & Deggobis, 1984; Spectrophotometry, MAGIC25 procedure Rimmelin & Moutin, 2005; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.931628; https://doi.pangaea.de/10.1594/PANGAEA.931628

Mesocosm experiments have been fundamental to investigate the effects of elevated CO2 and ocean acidification (OA) on planktic communities. However, few of these experiments have been conducted using naturally nutrient-limited waters and/or considering the combined effects of OA and ocean warming (OW). Coccolithophores are a group of calcifying phytoplankton that can reach high abundances in the Mediterranean Sea, and whose responses to OA are modulated by temperature and nutrients. We present the results of the first land-based mesocosm experiment testing the effects of combined OA and OW on an oligotrophic Eastern Mediterranean coccolithophore community. Coccolithophore cell abundance drastically decreased under OW and combined OA and OW (greenhouse, GH) conditions. Emiliania huxleyi calcite mass decreased consistently only in the GH treatment; moreover, anomalous calcifications (i.e. coccolith malformations) were particularly common in the perturbed treatments, especially under OA. Overall, these data ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2021-05-11. ...